Stove or furnace pipe damper.



PATENTED JULY 14, 1903.

E. N. LA VEINE. STOVE OR FURNACE PIPE DAMPER.

APPLICATION FILED DBO. 3, 1901.

N0 MODEL.

m n a W I Patented July 14, 1903.

PATENT OFFICE.

EDW'ARD N. LA VEINE, OF KANSAS CITY, MISSOURI.

STOVE OR FURNACE PIPE DAMPER.

SPECiFIGATION forming part of Letters Patent No. 733,404, dated. July 14, 1903.

Application filed December 3, 1901- Serial No. 84,589. (No model.)

To a, whom it may concern.-

Be it known that I, EDWARD N. LA VEINE, a citizen of the United States, residing at Kansas City, in the county of Jackson and State of Missouri, have invented certain new and useful Improvements in Stove or Furnace Pipe Dampers, of which the following is a specification.

My invention relates to stove or furnace pipe dampers; and my object is to produce a structure of this character which enables the operator to vary the size of the draft-passage without deflecting the products of combustion out of the axial line of the pipe.

A further object is to produce a structure of this character which can be easily and cheaply made and applied and is of simple, strong, and durable construction.

To these ends the invention consists in certain novel and peculiar features of construction and combinations of parts, as hereinafter described and claimed, and in order that it may be fully understood referenceis to be had to the accompanying drawings, in which Figure 1 is a vertical central section of a section of stovepipe equipped with a damper embodying my invention. Fig. 2 is a horizontal section taken through the pipe-section above the damper.

Referring now to the drawings in detail, 1 designates a portion of a stove or furnace, and 2 the collar thereof, upon which the pipe-section 3 is fitted in the usual or any preferred manner, which pipe-section at diametrically opposite points is provided with small openings 4.

5 designates a truncated cone whose external diameter at its base is equal to the internal diameter of the pipe-section, and said cone is composed of two sections 6 and 7, each section comprising somewhat more than half a cone, so than when the damper is closed, as shown in full lines, said sections shall overlap, the section 6 in this instance being shown as externally embracing the section 7. To insure the reliable operation of said sections toward each other, the inner margins of the inner section 7 are preferably turned inward, as at 8, so as to provide a beveled or rounded surface, which by abrasion with the straight inner edges or margins of section 6 will tend to deflect or spring said margins of the inner section farther inward, thus insuring the proper overlapping of said sections, so as to form the truncated cone open onlyat its upper and lower ends. As seen in Fig.2, the upper end of the outer section comprises more than a semicircle. Hence when the sections are brought together this end will spring around and frictionally clamp the corresponding end of the inner section. Said sections at the base of the cone and in the plane ofits axis are mounted on pivots 9, secured in the pipe-section, so that the operation of the sections shall be directly toward and from the openings 4. Various devices may be resorted to for easily and synchronously operating said cone-sections. I have illustrated herein what I deem the simplest and cheapest device or devices for effecting this purpose, the same comprising a bar 10, projectingthrough each opening at and formed with a handle 11 atits outer end and pivotally connected at its inner end to a rigid arm 12, secured to a conesection, said bars being also provided with notches 13 at their lower edges adapted for engagement with the lower edges of openings 4, so as to secure the sections in their closed position, as shown in full lines, in their wideopen position, as shown in dotted lines, or in any intermediate position. When opened to their widest extent, the arms 12 project through openings 4 and permit bars 10 to assume the pendent position, (shown in dotted lines, Fig. 1,) in which position they are more completely out of the Way than they would be if they were rigid continuations of arms 12, as will be readily understood. It will be noted that the operating means for the sections are entirely separate, and hence the sections can be adjusted independently, which is often desirable. When starting the fire, the sections will be opened to their widest extent and in such position afford practically no obstruction to the full force of the draft, which would be interfered with if deflected out of its proper path. After the fire is burning properly the sections are brought together, as shown, or to an intermediate position, so as to contract the area of the passage through which the smoke and other products of combustion pass without being deflected from their straight and most direct course. This contraction of the exit-point of the coneresults in checking the upward passage of the heavier smoke and gases and in the more forceful discharge from the small exit-opening of the lighter gases. This causes the heavier smoke and gases to circulate through the lower portion of the cone and over the fire, where they are elfectually consumed, and this desirable result is further insured because the cone attains an exceedingly high temperature and superheats its contents to such an extent that expansion and considerable back pressure takes place,

this expansion obviously effecting a more forceful discharge through the exit-opening of the cone and a more rapid circulation of the heavier products of combustion than would otherwise occur. It will thus be seen that by the combustion of practically all combustible matter in the fuel a great economy in the use of the latter is effected without a corresponding decrease of heat energy.

It is obvious that changes may be made in the detail construction, form, arrangement, and proportion of the parts and in the means for operating the cone-sections without departing from the spirit or scope or sacrificing any of the advantages of the invention.

Having thus described the invention, what I claim as new, and desire to secure by Letters Patent, is-- 1. In a damper, the combination with a pipe, having opposite openings; of a cone therein comprising two longitudinal sections pivoted at their base to each other and to the pipe, arms projecting rigidly from the backs of the sections at points to pass through said openings in the pipe, and notched bars pivoted to said arms for operating the sections independently.

2. A damper for pipes, consisting of a cone made in two longitudinal sections overlapping and pivoted at their larger ends, the outer section comprising more than a semicircle at its smaller end whereby it may spring frictionally around the smaller end of the inner section, and means for supporting and operating the whole.

In testimony whereof I aifix my signature in the presence of two witnesses.

EDWARD N. LA VEINE.

I Witnesses:

H. C. RODGERS, G. Y. THORPE. 

